document.write( "Question 843683: A pharmacist is preparing a 300-milliliter solution of 25% alcohol. If she has 15% and 45% alcohol solutions in stock, how much of each must she use? \n" ); document.write( "

Algebra.Com's Answer #508515 by Fombitz(32388) $\"\"$ $\"About$

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Volume:
\n" ); document.write( "1. $\"A%2BB=300\"$
\n" ); document.write( "Concentration:
\n" ); document.write( " $\"15A%2B45B=25%28300%29\"$
\n" ); document.write( " $\"15A%2B45B=7500\"$
\n" ); document.write( "2. $\"A%2B3B=500\"$
\n" ); document.write( "Subtract eq. 1 from eq. 2,
\n" ); document.write( " $\"A%2B3B-A-B=500-300\"$
\n" ); document.write( " $\"2B=200\"$
\n" ); document.write( " $\"B=100\"$
\n" ); document.write( "and from eq.1,
\n" ); document.write( " $\"A%2B100=300\"$
\n" ); document.write( " $\"A=200\"$
\n" ); document.write( "200ml of 15% and 100ml of 45%.
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